adding prototype trim as fallback for IE8

core/js/compatibility.js

@@ -23,3 +23,10 @@ if (!Function.prototype.bind) {
 		return fBound;
 	};
 }
+
+//https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/String/Trim
+if(!String.prototype.trim) {
+	String.prototype.trim = function () {
+		return this.replace(/^\s+|\s+$/g,'');
+	};
+}
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